Abstract
Accurate radio channel modeling is essential for simulation and performance prediction of wireless sensor networks (WSNs). This paper presents results of radio channel measurements performed in a difficult propagation environment. In particular, signal path loss is measured in case transmit and receive antennas are placed directly on a metal bridge segment. Line of sight (LOS) and non line of sight (NLOS) scenarios are evaluated at 868MHz SRD and 2.4 GHz ISM bands. The purpose of these channel measurements and modeling is to facilitate the design, evaluation and simulation process of WSNs for integrity monitoring of metal rich structures such as bridges, viaducts or industrial assets.
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